Page 173 - CITS - Welder - TT - Hindi

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Preheating temperatures Approximate composition (percentage) Recommended
for plain and alloy steels preheating temperature
% Carbon °C °F
PLAIN CARBON STEELS C
Plain carbon Below 0.20 Up to 95 Up to 200
Plain carbon 0.20 to 0.30 95 to 150 200 to ¬300
Plain carbon 0.30 to 0.45 150 to 280 300 to 500
Plain carbon 0.45 to 0.80 260 to 425 500 to 800
CARBON MOLYBDENUM C Mo
STEELS 150 to 260 300 to 500
Carbon molybdenum 0.10 to 0 .20 0.50 200 to 315 400 to 600
Carbon molybdenum 0.20 to 0.30 0.50 260 to 425 500 to 800
Carbon molybdenum 0.30 to 0.35 0.50

MANGANESE STEELS C Mn Si 150 to 260 300 to 500
Silicon structural 0.35 0.80 0.25 150 to 260 300 to 500
Medium manganese 0.20 to0 .25 1.0 to 1.75 200 to 425 400 to 600
SAE T 1330 0.30 1.75 260 to 425 500 to 600
SAE T 1340 0.40 1.75 315 to 480 600 to 900
SAE T 1350 0.50 1.75 Usually not Usually not
12% Manganese 1.25 12.0 required required

NICKEL STEELS C Ni Up to 150 Up to 300
SAE 2015 0.10 to 0.20 0.50 95 to 150 200 to 300
SAE 2115 0.10 to 0.20 1.50 95 to 200 200 to 400
2”% Nickel 0.10 to 0.20 2.50 95 to 260 200 to 500
SAE 2315 0.15 3.50 95 to 260 200 to 500
SAE 2320 0.20 3.50 150 to 315 300 to 600
SAE 2330 0.30 3.50 200 to 370 400 to 700
0SAW 2340 0.40 3.50
LOW CHROME C Cr Mo
MOLYBDENUM STEELS Up to .15 2.0 0.5 0 C 0 F
2% Cr. ”% Mo 0.15 to 0.25 2.0 0.5 200 to 315 400 to 600
2% Cr. ”% Mo Up to 0.15 2.0 1.0 260 to 425 500 to 800
2% Cr. 1% Mo 0.15 to 0.25 2.0 1.0 260 to 370 500 to 700
2% Cr. 1% Mo 315 to 425 600 to 800
MEDIUM CHROME C Cr Mo
MOLYBDENUM STEELS Up to 0.15 5.0 0.5 500 to 800
5% Cr. ”% Mo 0.15 to 0.25 5.0 0.5 260 to 425 600 to 900
5% Cr. ”% Mo 0.15 Max. 8.0 1.0 315 to 480 600 to 900
8% Cr. 1% Mo 315 to 480
PLAIN HIGH C Cr
CHROMIUM STEELS 0.10 13.0 150 to 260 300 to 500
12 to 14% Cr TYPE 410 0.10 17.0 150 to 260 300 to 500
16 to 18% Cr TYPE 430 0.10 26.0 150 to 260 300 to 500
23 to 30% Cr TYPE 446

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